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What is correct for blood group 'O'?

1. No antigens but both a and b antibodies are present
2. A antigen and b antibody
3. Antigen and antibody both absent
4. A and B antigens and a, b antibodies

Correct answer: No antigens but both a and b antibodies are present

Solution

Blood group O red cells do not carry A or B antigens on their surface. Because of this, the plasma contains both anti-A and anti-B antibodies, making option A correct.

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